Windows 11 24H2 (Build 26100.9550)

ProductWindows 11 Version24H2 Release dateSep 22, 2026 File size

Evidence summary: Not enough reports 0 confirmed patch-specific community reports

Accepted reports: 0
Latest evidence run: Oct 6, 2026
Healthy sources: 2 fresh (success / no reports) · need 2

Microsoft Q&A (search) Checked — no reports found last checked Oct 6, 2026
techcommunity windows sitemap Checked — no reports found last checked Oct 6, 2026

Monitoring reflects community-evidence collection health for this exact release — an absence of reports is not a safety guarantee, and this is separate from the AUXSAYS verdict.

Vendor Known Issues — 4 active vendor-known issues

4 active 6 resolved

Official vendor Release Health status. Not counted as community reports. Official source ↗

Official Patch Notes — vendor release notes captured from the official source

Windows 11 24H2 cumulative update, OS build 26100.9550 (KB5124010). Released 2026-09-22 on the General Availability Channel. Update type 2026-09 D. This is the official Microsoft Windows release-health entry (learn.microsoft.com/windows/release-health). Known-issue and safeguard-hold details are published on the per-version Windows release-health status page. Microsoft Release Health status (official) for Windows 11.

Windows 11 in these notes: .

Microsoft Release Health status (official) for Windows 11 24H2: 4 active known issue(s), 6 resolved, 0 safeguard hold(s). Source: official Microsoft Windows release-health status page. This is vendor-published operational status, not user reports.

Resolved: Incorrect notifications that “Microsoft Defender Antivirus is turned off” Microsoft Defender Antivirus remains active and functioning correctly despite notifications following the latest update. — status Resolved; originating N/A; last updated 2026-09-30 16:42 PT.
Active: Devices might experience a black screen or desktop loading issues after sign-in Microsoft has received reports of this issue occurring in some virtual desktop environments. — status Mitigated; originating OS Build 26100.9278 KB5120998; last updated 2026-09-29 10:12 PT.
Active: Domain-joined devices might lose their secure trust relationship with the domain Some Credential Guard protected machine accounts might be unable to sign in interactively will valid domain credentials. — status Mitigated; originating OS Build 26100.9445 KB5124008; last updated 2026-09-29 10:12 PT.
Active: USB audio devices might fail to start or produce no sound Some USB Audio Class 1.0 devices display Code 10 or fail in multichannel audio modes after installing the Sept. 8 update — status Mitigated; originating OS Build 26100.9445 KB5124008; last updated 2026-09-29 10:12 PT.
Resolved: Remote Desktop Services might stop responding after Sept. 2026 security update Some Windows devices with Remote Desktop enabled might experience Remote Desktop Services (RDS) instability. — status Resolved KB5129195; originating OS Build 26100.9445 KB5124008; last updated 2026-09-17 19:22 PT; resolved by KB5129195.
Resolved: Host folder shares might be unavailable in Hyper-V-based Linux VMs Plan9 host folder shares might not appear in the guest environment after installing the September 2026 security update. — status Resolved KB5129195; originating OS Build 26100.9445 KB5124008; last updated 2026-09-14 13:30 PT; resolved by KB5129195.
…and 4 more known issue(s) on the official status page.

Technical Details

Released: Sep 22, 2026
File size
Official source checked: Oct 6, 2026
Official notes checked: Oct 6, 2026

Checksum

Use these hashes to verify downloaded installers match the files published with the official release.

User Reports / Sources (0)

No user report sources have been counted for this record yet.

Official sources

Microsoft. (2026, September 22). Windows 11 release information.release health
Microsoft. (2026, September 22). Windows release health.release health
Microsoft. Download page.download